Question

Answer 1

Bài 3:

1: a//b

=>\(\hat{A_2}=\hat{B_2}\) (hai góc đồng vị)

=>\(\hat{B_2}=130^0\)

2: a//b

=>\(\hat{A_4}=\hat{B_4}\) (hai góc đồng vị)

=>\(\hat{B_4}=120^0\)

3: a//b

=>\(\hat{A_4}=\hat{B_2}\) (hai góc so le trong)

=>\(\hat{B_2}=110^0\)

4: a//b

=>\(\hat{A_3}=\hat{B_1}\) (hai góc so le trong)

=>\(\hat{B_1}=65^0\)

5: a//b

=>\(\hat{A_1}=\hat{B_1}\) (hai góc đồng vị)

=>\(\hat{A_1}=55^0\)

6: a//b

=>\(\hat{B_3}=\hat{A_3}\) (hai góc đồng vị)

=>\(\hat{A_3}=80^0\)

7: a//b

=>\(\hat{B_2}+\hat{A_3}=180^0\) (hai góc trong cùng phía)

=>\(\hat{A_3}=180^0-115^0=65^0\)

8: a//b

=>\(\hat{A_4}+\hat{B_1}=180^0\) (hai góc trong cùng phía)

=>\(\hat{B_1}=180^0-105^0=75^0\)